Method for preparing silicon-containing micron-fiber-toughened PHBV composite material

A technology of micro-fiber and composite material, which is applied in the field of preparation of silicon-containing micro-fiber toughened PHBV composite material, can solve the problems of large chemical agents, power, consumption, etc., achieve uniform distribution, overcome flocculation phenomenon, and have a wide range of effects.

Inactive Publication Date: 2015-04-22
NANJING FORESTRY UNIV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

This method overcomes the shortage that existing plant fibers need to be made into nanoscale when toughening PHBV, and consumes a large amount of chemical agents and power. At the same time, the silica material is attached to the fiber surface during the plant fiber separation process, and its size and shape remain the same. Maintained at the micro-nano level, it has a toughening effect on PHBV

Method used

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  • Method for preparing silicon-containing micron-fiber-toughened PHBV composite material

Examples

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Effect test

Embodiment 1

[0014] Example 1, disperse 1g of silicon-containing fiber raw material in 10g of aqueous sodium hydroxide solution with a mass fraction of 10%, and keep it at 20°C for 8h to obtain a blend of silicon-containing fiber and aqueous sodium hydroxide solution; After dilution and filtration, 1% polyethylene glycol was added to the obtained precipitate, and then a homogenizer was used for low-pressure crushing, the crushing pressure was 100 bar, and the number of cycles was 15 times to obtain a silicon-containing micron fiber blend, which was separated, Vacuum drying to obtain silicon-containing microfibers. Melt-blending the prepared silicon-containing micron fibers and poly(β-hydroxybutyrate-β-hydroxyvalerate) (PHBV) at a mass ratio of 1:25, the processing temperature was 175°C, and the screw speed was 10r / min, with a blending time of 2.5min, extruded and granulated to make a toughened PHBV composite material containing silicon microfibers. After testing, the tensile elongation a...

Embodiment 2

[0015] Example 2, disperse 2g of silicon-containing fiber raw material in 40g of aqueous sodium hydroxide solution with a mass fraction of 35%, and keep it at 30°C for 6h to obtain a blend of silicon-containing fiber and aqueous sodium hydroxide solution; the above blend After dilution and filtration, 3% polyethylene glycol was added to the obtained precipitate, and then a homogenizer was used for low-pressure crushing, the crushing pressure was 150 bar, and the number of cycles was 10 times to obtain a silicon-containing micron fiber blend. After separation, vacuum Dry to obtain silicon-containing microfibers. Melt-blending the prepared silicon-containing micron fibers and poly(β-hydroxybutyrate-β-hydroxyvalerate) (PHBV) at a mass ratio of 1:15, the processing temperature was 185°C, and the screw speed was 15r / min, with a blending time of 3.5min, extruded and granulated to make a toughened PHBV composite material containing silicon microfibers. After testing, the tensile el...

Embodiment 3

[0016] Example 3, disperse 2g of silicon-containing fiber raw material in 25g of 20% aqueous sodium hydroxide solution by mass fraction, and keep it at 30°C for 6h to obtain a blend of silicon-containing fiber and aqueous sodium hydroxide solution; the above blend After dilution and filtration, 5% polyethylene glycol was added to the obtained precipitate, and then a homogenizer was used for low-pressure crushing, the crushing pressure was 200 bar, and the number of cycles was 6 times to obtain a silicon-containing micron fiber blend, which was separated, Vacuum drying to obtain silicon-containing microfibers. Melt-blending the obtained silicon-containing micron fibers and poly(β-hydroxybutyrate-β-hydroxyvalerate) (PHBV) at a mass ratio of 1:10, the processing temperature is 185°C, and the screw speed is 20r / min, with a blending time of 5 minutes, extruded and granulated to make a toughened PHBV composite material containing silicon microfibers. After testing, the tensile elo...

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Abstract

The invention discloses a method for preparing a silicon-containing micron-fiber-toughened PHBV composite material and belongs to the field of natural polymer material-toughened biodegradable plastics. The method comprises the following steps of dispersing a silicon-containing raw material in an aqueous sodium of sodium hydroxide with mass fraction of 10-35%, holding the temperature in a temperature range of 20-40 DEG C for 4-8 hours, diluting, filtering, adding 1-5% of a dispersant, carrying out low-pressure crushing by a homogenizing apparatus at a homogenizing pressure of 100-200bar, cycling for 6-15 times, separating and carrying out vacuum drying treatment to obtain silicon-containing micron-fiber; carrying out melt blending on silicon-containing micron-fiber, poly(beta-hydroxybutyrate-beta-hydroxyvalerate) (PHBV) at a mass ratio of (1:10)-(1:25), carrying out extrusion molding and granulating to prepare the silicon-containing micron-fiber-toughened PHBV composite material. By the method, when PHBV is toughened by virtue of the plant fiber in the prior art, the problems that the plant fiber needs to be prepared into nanoscale, a large amount of chemicals and power are consumed and the process is complex can be solved. According to the method for preparing the composite material, the agricultural residues can be utilized and thus the environment friendliness is achieved.

Description

technical field [0001] The invention relates to a preparation method of a silicon-containing micron fiber toughened PHBV composite material, which belongs to the field of toughened biodegradable plastics made of natural polymer materials. Background technique [0002] With the increasing shortage of petroleum resources and the aggravation of "white pollution", the use of biopolymers to replace petroleum-synthesized plastics has become a hot spot of concern all over the world. Poly(β-hydroxybutyrate-β-hydroxyvalerate) (PHBV) has many excellent properties such as biodegradability, biocompatibility, piezoelectricity, and optical activity. It is used in surgical sutures, degradable packaging materials, Agricultural plastic film and other fields have broad application prospects. In actual use, polymer materials not only need to have high strength, but also high toughness, especially when used as structural materials. PHBV is an isotactic crystalline polyester, similar to polypr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08L97/02B29C47/92B29C48/92
Inventor 潘明珠杜俊梅长彤周晓燕连海兰徐信武
Owner NANJING FORESTRY UNIV
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